Machining center



FIG. 1 is a front right-side perspective view of a machining center showing my new design;

FIG. 2 is a front left-side perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right view thereof; and,

FIG. 7 is a plan view thereof. 

CLAIM The ornamental design for a machining center, as shown and described. 